Iran’s President Hassan Rouhani on Sunday told the visiting head of the U.N. nuclear agency that Tehran has never pursued nuclear weapons and that inspectors should be “fair” when they help implement a landmark nuclear deal reached with world powers in July.

Yukiya Amano, the head of the International Atomic Energy Agency, arrived in Tehran earlier in the day on his second visit in the past three months, ahead of an Oct. 15 deadline to gather information on allegations that Iran had in the past tried to build atomic weapons. A final U.N. assessment is due in December.